Abstract
From crosses between allotriploid plants with genomes AAC and diploid O. sativa plants (AA), twelve types of alien addition lines with single C-genome chromosome were distinguished on the basis of morphological characteristics of the addition type plants. Of the twelve chromosomes of O. officinalis (W0065), six appeared to be homoeologous with those of O. sativa in varying degrees. The occurrence of many univalents in the PMCs of two alien addition lines, G and J, suggests that two chromosomes of O. officinalis (W0065) have genes which disturb the pairing of homologous sativa chromosomes.
